The case for dynamic subsidence of the U.S. east coast since the Eocene
The case for dynamic subsidence of the U.S. east coast since the Eocene
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DOI：
10.1029/2008gl033511
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发表时间：
2008-04
影响因子：
5.2
通讯作者：
S. Spasojević;Lijun Liu;M. Gurnis;R. Müller
中科院分区：
文献类型：
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作者：
S. Spasojević;Lijun Liu;M. Gurnis;R. Müller
美国东海岸的动态沉降是利用区域和全球对海平面、古海岸线海拔的估计之间的差异以及同化板块运动和地震层析成像的地幔对流伴随模型来解决的。始新世和中新世古海岸线的位置低于全球海平面的预测，表明自始新世末以来至少有 50 m，甚至可能多达 200 m 的沉降。动态模型预测自始新世末以来东海岸会发生沉降，但确切的幅度尚不确定。这种沉降是在全球海平面整体下降期间发生的，海平面变化大于动态沉降；这导致在没有地面沉降的情况下区域海平面下降。动态沉降与新泽西沿海平原的海平面稳定和区域海平面之间的差异一致。
The dynamic subsidence of the United States east coast is addressed using the discrepancy between regional and global estimates of sea level, elevation of paleoshorelines, and adjoint models of mantle convection that assimilate plate motions and seismic tomography. The positions of Eocene and Miocene paleoshorelines are lower than predicted by global sea levels, suggesting at least 50 m, and possibly as much as 200 m of subsidence since the end of the Eocene. Dynamic models predict subsidence of the east coast since the end of Eocene, although the exact magnitude is uncertain. This subsidence has been occurring during an overall global sea‐level fall, with the eustatic change being larger than the dynamic subsidence; this results in a regional sea‐level fall in the absence of land subsidence. Dynamic subsidence is consistent with the difference between eustasy and regional sea level at the New Jersey coastal plain.